<div>
  <button class="red">빨강</button>
  <button class="green">초록</button>
  <button class="blue">파랑</button>
</div>
div:has(.red:active) {
  background: red;
}

div:has(.green:active) {
  background: green;
}

div:has(.blue:active) {
  background: blue;
}

div {
  border: 1px solid black;
  padding: 50px;
}

body {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100dvh;
}

External CSS

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External JavaScript

This Pen doesn't use any external JavaScript resources.